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ELECTRIC LAMP. v No. 253,328. Patented Feb. 7,1882.

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ELEGTRIG LAMP.

Patented Feb. 7,1882.

Fia:4 INVENTUHI UNITED STATES PATENT *OFFICE.

ADDISON Gr. VVATERHOUSE, OF NEW YORK, N. Y., ASSIGNOR TO THE UNITEDSTATES ELECTRIC LIGHTING COMPANY, OF SAME PLACE.

ELECTRIC LAMP.

SPECIFICATION forming part of Letters Patent No. 253,328, dated February'7, 1882.

Application tiled October 7, 1881.

To all whom it may concern:

Be it known that I, ADDISON G. WATER- HOUSE, a citizen of the UnitedStates, residing in New York, in the county and State of New York, haveinvented certain new and useful Improvements in ElectricLamps, of whichthe following is a specification, reference being had to the drawingsaccompanying and forming a part thereof.

My invention relates to are lamps, and is directed mainly to theattainment of a delicate and accurate action of the electromagnets usedin conjunction with the feed controlling or regulating mechanism. Forthis purpose I arrange the movable portions of the magnet or magnets insuch manner that the weight for any given size of magnets sustained bymagnetic attraction while the lamp is in operation is reduced to aminimum and a greater range of motion secured without sensiblediminution of attractive power than is possible with any of the forms oflamps heretofore in use.

In the accompanying drawings, illustrative of the manner in which myinvention is or may be carried into effect, Figurel is an interior sideview of the upper portion of the lamp; Fig. 2, a top view of the same;Fig. 3, a detached portion of the feed mechanism; and. Fig. 4, an-

0 other view of the same, with the addition of a portion of theclamping-lever.

Similar letters of reference indicate corresponding parts in all thefigures.

H designates the usual metallic frame-work 5 of an electric-lampregulator, and J the cap or cover forcontaining the feed-controllingmechanism. Secured to the upper portion of the frame, by means of clampsor screws which pass into extensions from insulatingend pieces orplates, are two electromagnetic helices or coils, A A. Coil A iscomposed of insulated wire ofcoi nparatively large diameter, and isarranged in the main circuit of the lamp-that is to say, the circuitwhich includes the carnon electrodes. Coil A is composed of fineinsulated wire wound in the same direction as the coarse wire, but beingof considerably greater length it offers a high resistance to thepassage ofthe current. It forms part of a shunt or derived circuit aboutthe lamp. Helix A (No model.)

contains a fixed soft-iron core having right-angled polar extensions E,reaching as far as or slightly beyond the edges of the end pieces orplates, as shown. Attached to or forming part of the end plates of helixA are two standards 5 or arms, (lettered respectively B B by means ofwhich a cylindrical core with right-angled polar extensions E,corresponding to those of magnet A, is held by pivoting-screws D D,which provide for a rotation of the said core about a central axis.

I is a carbon-holding rod or tube passing between the helices orelectro-magnets A A, and arranged to enter a tube composed of sections aand h, and secured to the frame 11 by nut K.

N is a. clamping device, a plan of which is shown in Fig. 4, consistingof a plate or bar having a circular opening of such diameter that it maygripe the carbon-carrier I when tilted, but allow the same to slipthrough it when allowed to assume a horizontal position.

F is a bar, to which the end of clampingleverN is hinged. It is itselfhung by rigid or pivoted arms F to the extensions E' of the movable coreaforesaid, so that as the latter is raised the clamping-lever is tiltedand caused to bind and raise the carbon-holder I.

G is a dash-pot, connected by an arm, L, with the movable core or one ofits extensions E, its function being to preclude sudden movement or ierking of the moving parts.

The operation of the above-described lamp will be readily comprehendedfrom the fact that it is similar in principle to that of others now inuse-that is to say, the extensions E are raised toward the extensions Ewhen the distance of the carbons apart is not sufficient to divert anyconsiderable portion of the current through the coil of electro-magnetA. The lever N is in consequence tilted and caused to bind thecarbon-holder I, maintaining it in an elevated position. As the carbonsare consumed, however, the relative attraction of the two magnets A Avaries, until, by the energizing eifect of the current in the coils ofmag- 5 net A, the core of the same is magnetized sufficiently toneutralize the attractive force existing in the polar extensions E E.These latter thereupon recetle or fall until the position of the clampallows the red I to feed, I03

when the original condition of attraction and relative distribution ofcurrent in the two magnets is re-established.

The lamp above described, while embodying the features essential to theattainment of the results described, may within certain limits beconsiderably varied in the matter of the mechanical construction andarrangement of its several component parts. Such variations consistmainly in having the main magnet stationary and the shunt-magnetmovable, or, it" so desired, in winding the coil of the movable magnetdirectly upon the core, so that both shall move together. As a stillfurther varia tion of the forms described, I may wind both coils uponthe same corc-either the stationary or movable core-and utilize theother core simply as an armature. In such case it is evident that thewinding of the two coils must be in opposite directions, or thatthecurrents viz., that in the main and that in the shunt must be caused topass the coils in such manner as to exert a contrary magnetic effectupon the common core. In all cases, however, the parts which ordinarilyadd to the weight which has to be lifted by the force of magneticattraction is reduced to a minimum, while the strongest magneticett'ects are obtained from the use of only two coils. The inertia of themoving parts being in this manner greatly reduced, variations inmagnetic attraction will be much more accurately responded to, andmagnets of greatly-increased sustaining power may be employed withoutaffecting the delicacy of action. The additional advantage incident toswinging magnets of an increased range of motion is in this form ofmagnet fully realized.

Having now described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. In an electriclamp, the combination,with the feed-controllingmechanism, of a fixed and pivoted electro-magnct, each containing asingle core, with pole-pieces extending at right angles therefrom, oneof said magnets being included in the main or lamp circuit, and theother in a shunt or derived circuit, substantially as and for thepurpose set forth.

2. In an electric lamp, the combination of a fixed electro-niagnet,composed of a helix and core, with right-angled polar extensions, with asimilarly-constructed electro-magnet connected with the feed-controllingmechanism and pivoted in such a manner that its polar extensions mayswing in face of those of the said fixed magnet, one of said magnetsbeing included in the lamp-circuit, the other in a shunt or derivedcircuit about the lamp, as set forth.

3. The coinbination,in an electric lamp, with the feed-controllingmechanism, of a fixed electro-magnet composed of a single helix, and acorehaving right-angled polar extensions, and an electro-magnet composedof a stationary helix and a core capable of rotation therein, andprovided with right-angled polar extensions, one of said magnets beingincluded in the main or lamp circuit, the other in a shunt about thelamp, substantially as and for the purpose set forth.

In testimony whereof I have hereunto set my hand this 20th day ofSeptember, 1881.

ADDISOh G. WATERIIOUSE.

Witnesses:

PARKER W. PAGE, W. FRISBY.

